In an ideal world, to be able to survive a global food crisis during a high-risk period, each household should have a three-month stockpile of food at home. Such foods could include sacks of rice, barley, dried maize, beans, peas, oats, grains, dried fruit, tinned foods, milk powder, etc. You can create a system whereby you replace this stockpile on a rolling basis to ensure food does not spoil.
As part of your preparation for a climate switch and living sustainably at home, you should have a plan for growing food. Ideally, you should have the growing systems already in place and ready to go. Teach your children this more self-sufficient way of obtaining food, just as rural people in developing nations do with their children.
Practice using the different growing methods described above, and growing and storing food like potatoes, beans, peas, maize, pumpkins, and gourds. Practice growing crops (see below) and then harvesting and replanting their seeds. Practice growing food in costales, especially potatoes. In a climate crisis or a freezing northern summer you can then take your food indoors and keep it safe at night.
Keep a seed bank at home that contains short-cycle and climate-adapted vegetable seeds, and ensure these seeds yield plants that are not sterile. Keep seed potatoes at the ready in a dark, dry place, and replace these as required all year round. Develop a calendar for planting seeds to help organize your growing seasons.
The following are seeds to consider for your seedbank. (1) Cold-Adapted Crops. Potatoes, beets, cabbage, onions, turnips, parsnips, carrots, maize, climbing beans, winter pumpkin (squash), broccoli, kale, spinach, leeks, asparagus, brussel sprouts, and radishes. (2) Drought-Tolerant Crops. Millets, rye, drought-tolerant maize, sorghum, rye, wheat, pigeon pea, and cowpea. (3) Short-Cycle Crops (3-4 months). Potatoes, sweet potatoes, leafy greens, tomatoes, cucumbers, peppers, and radishes.